503 EM 385-1-1 Sections 27-34

Underwater welding and burning must be limited to SSA (surface supplied air) mode only.

Diver welding under water must configure equipment and procedures IAW the U.S. Navy.

Equipment configuration and procedures must be in accordance with the U.S. Navy
Underwater Cutting & Welding Manual, S0300-BB-MAN-010.
Divers performing underwater welding and burning operations must be equipped with the following as a minimum:

(1) A rubber or neoprene dive suit in good condition that provides electrical insulation to the diver;
(2) Insulating gloves with a cuff that, as a minimum, reaches and fully covers the wrist;
(3) A welding/burning eye shield attached to the dive helmet with appropriate shade for the conditions at the working area.

30.C.01 SCUBA diving operations must not be conducted:

At depths greater than 100 ft (30.5 m);
On dives outside the no-decompression limits unless a dual lock, multi-place, recompression chamber (capable of recompressing diver at the surface to a depth equivalent to 165 ft (50.3 m) of sea water) is available at the dive location and is immediately available for use, a trained competent operator is on site, and the chamber is of sufficient size to accommodate the diver as well as an inside tender;
Against currents exceeding one knot;
In enclosed or physically confining spaces;
Using closed circuit or semi-closed circuit SCUBA;
In visibility less than 3 ft (0.9 m) unless line tended with diver/surface two-way voice communications;
In areas where pressure differentials exist and it cannot be positively verified that all potential leaks have been eliminated;
When the diver does not have direct access to the surface.

30.C.02 Specific operational requirements for SCUBA operations are as follows:

SCBA diving in cold environments.

The minimum sized SCUBA tank allowed as primary air is a standard 80 ft³ aluminum tank pressurized to at least 2,700 PSI at the beginning of dive operations.

(1) Divers must terminate their dive so that they reach the surface with a minimum tank pressure of 500 PSI.
(2) Each diver must be equipped with a minimum 30 ft³ bailout bottle for emergency use pressurized to at least 90 percent of its working PSI rating and equipped with a separate 1st and 2nd stage regulator. An "octopus" is not considered to be an alternate air source.

Each diver must be equipped with a buoyancy compensation device (BCD) having a manually activated inflation source, an oral inflation device, and an exhaust valve.
Each SCUBA diver must be equipped with a submersible cylinder pressure gauge capable of being monitored by the diver during the dive.
Each SCUBA diver must be equipped with a weight belt or assembly capable of quick release.
Each SCUBA diver must be equipped with a depth gauge and knife.
SCUBA air cylinders must comply with the following requirements:

(1) Air cylinders of seamless steel or aluminum that meet DOT 3AA and DOT 3AL specifications are approved for used on USACE projects;
(2) Each cylinder used on USACE projects must have identification symbols stamped into the shoulder of the tank; and
(3) SCUBA tanks used on USACE projects must be visually inspected internally at least annually and hydrostatically tested at least once every 5 years in accordance with DOT and the CGA regulations; hydrostatic test dates will be stamped into the shoulder of each tank.

A timekeeping device must be used for recording diving times for all SCUBA diving operations. When two-way voice communications are not used, each dive supervisor and diver must have a timekeeping device. When two-way voice communications are used, the dive supervisor, at a minimum must have a timekeeping device.
Each tethered SCUBA diver must wear a safety harness with a positive buckling device, attachment point for the safety line, and a lifting point to distribute the pull force of the line over the diver's body while maintaining the body in a heads-up vertical position when unconscious or inert.

30-12. In which of the following situations may SCUBA diving operations be conducted?

At depths greater than 100 ft (30.5 m)

When visibility under water is more than 3 ft (0.9 m)

In enclosed or physically confining spaces

Against currents exceeding one knot

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504 EM 385-1-1 Sections 27-34